I was wondering if anyone has experience registering a bike they built themselves in Japan. I'm putting together a new road bike from an existing groupset that I own, rims, and a new frame. Of course I have receipts for all component purchases past (groupset and rims) and present (frame).

Are their challenges or things to look out for when registering such a bike, obtained in the somewhat non-normal method (ie. not purchasing a bike fully built from a cycle shop)?